Spot Galvanometer finds extensive use as a D.C. null detector in wheat stone bridges and potentiometers. It is a' mains' operated instrument but can operate on a 6 volt battery also. There is provision to operate this instrument can be operated on both as well as main supply 220 volts, 50Hz or 6 Volt Capacity. The light Source is 6 Volt and 0.3Amp bulb giving a bright spot on the scale.
